How to integrate Google Adwords API into Codeigniter?

One blogger gave me idea

Just add all the api documents to the third_party folder and require the library from your controller or library and voilà!

Figure: Google Adwords API Hierarchy

After many hours of searching, reading and testing I was successful to integrate AdWords API PHP Client Library into Codeigniter 2.X.

Step by step guide on how to integrate Google Adwords API into Codeigniter.

Google Adwords API into Codeigniter

#	Steps	Description
1.	Download AdWords API PHP Client Library	This client library makes it easier to write PHP applications that programmatically access the AdWords API or DoubleClick Ad Exchange Buyer API. I have downloaded version 4.5.1(adwords_api_php_4.5.1)
2.	Extract the compressed archive (.zip or .tar.gz) and paste the src folder inside codeigniter's third_party folder.	Grab only src folder from the compressed files. Create a folder called Adwords inside CodeIgniter’s application/third_party/ and paste src folder inside CodeIgniter’s application/third_party/Adwords/ folder. Your application/third_party/ folder will look like application/third_party/Adwords/src/...
3.	Create a php file inside Codeigniter's library folder.	Create new PHP file inside Codeigniter’s application/libraries/ name it My_adwords.php
4.	Set the correct path to access Adwords API.	Check the source code below on how to set the correct path on application/libraries/My_adwords.php. I have added GetCampaigns function (copied from Example folder of google adwords php client library) to check later if it returns any values.
5.	Now you can use My_Adwords library in your CodeIgniter’s controller code.	Now you can easily access the My_Adwords library from the Codeigniter's controller like any other library methods. I have created a controller called adwords.php inside application/controller/ and call the function to fetch all the active campaigns. You can get the source of controller adwords.php
6.	Test the controller and enjoy.	Type the 'localhost/your_project_folder/adwords/' in your browser and you can see the result. You can see my result in the end.

Set the correct path on application/libraries/My_adwords.php

<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
define('SRC_PATH', APPPATH.'/third_party/Adwords/src/');
define('LIB_PATH', 'Google/Api/Ads/AdWords/Lib');
define('UTIL_PATH', 'Google/Api/Ads/Common/Util');
define('AW_UTIL_PATH', 'Google/Api/Ads/AdWords/Util');

define('ADWORDS_VERSION', 'v201306');

// Configure include path
ini_set('include_path', implode(array(
    ini_get('include_path'), PATH_SEPARATOR, SRC_PATH))
    );

// Include the AdWordsUser file
require_once SRC_PATH.LIB_PATH. '/AdWordsUser.php';


class My_adwords extends AdWordsUser { 
    public function __construct() { 
       parent::__construct();
    }     
    
 function GetCampaigns() {
   // Get the service, which loads the required classes.
   $campaignService = $this->GetService('CampaignService', ADWORDS_VERSION);
 
   // Create selector.
   $selector = new Selector();
   $selector->fields = array('Id', 'Name');
   $selector->ordering[] = new OrderBy('Name', 'ASCENDING');
 
   // Create paging controls.
   $selector->paging = new Paging(0, AdWordsConstants::RECOMMENDED_PAGE_SIZE);
 
   do {
     // Make the get request.
     $page = $campaignService->get($selector);
 
     // Display results.
     if (isset($page->entries)) {
       foreach ($page->entries as $campaign) {
         printf("Campaign with name '%s' and ID '%s' was found.\n",
             $campaign->name, $campaign->id);
       }
     } else {
       print "No campaigns were found.\n";
     }
 
     // Advance the paging index.
     $selector->paging->startIndex += AdWordsConstants::RECOMMENDED_PAGE_SIZE;
   } while ($page->totalNumEntries > $selector->paging->startIndex);
 }  
}

source code: application/controllers/adwords.php

<?php 
error_reporting(E_STRICT | E_ALL);
ini_set('display_errors', '1');

if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Adwords extends CI_Controller{

function __construct()
 {
  parent::__construct(); 
  //load our new Adwords library
  $this->load->library('My_adwords');

 }

 function index()
 {
   $user = new My_adwords();
   $user->GetCampaigns();
 
 }


}

Result

Campaign with name 'Campaign test #1' and ID '150648975' was found. Campaign with name 'Interplanetary Cruise #52299d09d8493' and ID '150652815' was found. Campaign with name 'Interplanetary Cruise #52299d09d8517' and ID '150652935' was found.

Hope you will like my solution. If it helped you to save your time, feedback will be deeply appreciated. :)